CLASSIFICATION OF APUS

PHYLUM :- ARTHROPODA (Jointed appendages.)

CLASS :- CRUSTACEA (Thick exoskeleton, antennae 2 pairs)

SUB-CLASS :- BRANCHIOPODA (Trunk appendages act as gills)

ORDER :-  NOTOSTRACA (Carapace present)

GENUS :- Apus (Tadpole shrimp)

GEOGRAPHICAL DISTRIBUTION

  • It is found in most parts of the world especially in U.S.A., Kansas, Lower California, Texas, Mexico and Nebraska.

HABIT AND HABITAT

  • Apus is a fresh-water form.

APUS

GENERAL CHARACTERSTICS OF APUS

  • Commonly called as Tadpole shrimp.
  • Body divisible into head-thorax (Cephalothorax) and abdomen measuring 20 to 30 mm in length.
  • Head is broad, depressed and covered by a horse-shoe shaped carapace which bears eyes above, antennules and antennae beneath. The labrum, mouth, antennules, antennae, mandibles,  maxillae are present ventrally.
  • Anterior two-thirds of the dorsal surface is covered by a thin chitinous shell or carapace, which covers major part of the body.
  • Beyond the posterior edge of the carapace a cylindrical and segmented abdomen projects.
  • Last segment bears anus and a pair of long caudal styles.
  • On the dorsal surface of the carapace, near its anterior border, are paired eyes, median eye and dorsal organ
  • Sexes are separate. Males are few. In females few segments are without swimming
  • Development includes nauplius larva.
APUS

SPECIAL FEATURES

  • Reproduction is as a rule parthenogenetic because the males are rare. How they are able to carry genetic continuity is not clear.

IDENTIFICATION

  • The animal contains horse-shoe shaped carapace and all above features hence it is Apus.

APUS
APUS
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